That may be triggered.

One who or that which triggers.

plural of triggerer

Having a tendency or desire to shoot a firearm irresponsibly before adequately identifying the target. / (by extension) Inclined to behave recklessly or violently at the slightest provocation.

A thin loop surrounding the trigger of a weapon to keep it from accidental discharge.

A trigger that will set off a firearm when even a very small pressure is applied.

Unstable; in a situation that could be worsened by the slightest mistake. / Easily angered; having a short temper.

Alternative spelling of trigger-happy

a finger used in pulling the trigger of a firearm / the forefinger

To fire a gun. / (idiomatic) To commit to a course of action. / (soccer, idiomatic, intransitive) To shoot, kick the ball in hope of scoring a goal. / (tennis, informal) To hit a very powerful shot.